re PR go/72812 (reflect FAILs with Solaris as)

	PR go/72812
	* go-gcc.cc (char_needs_encoding): New static function.
	(needs_encoding, fetch_utf8_char): New static functions.
	(encode_id): New static function.
	(Gcc_backend::global_variable): Set asm name if the name is not
	simple ASCII.
	(Gcc_backend::implicit_variable): Likewise.
	(Gcc_backend::implicit_variable_reference): Likewise.
	(Gcc_backend::immutable_struct): Likewise.
	(Gcc_backend::immutable_struct_reference): Likewise.
	(Gcc_backend::function): Likewise.

From-SVN: r239179

gcc/go/ChangeLog

+2016-08-05  Ian Lance Taylor  <iant@google.com>
+
+	PR go/72812
+	* go-gcc.cc (char_needs_encoding): New static function.
+	(needs_encoding, fetch_utf8_char): New static functions.
+	(encode_id): New static function.
+	(Gcc_backend::global_variable): Set asm name if the name is not
+	simple ASCII.
+	(Gcc_backend::implicit_variable): Likewise.
+	(Gcc_backend::implicit_variable_reference): Likewise.
+	(Gcc_backend::immutable_struct): Likewise.
+	(Gcc_backend::immutable_struct_reference): Likewise.
+	(Gcc_backend::function): Likewise.
+
 2016-08-02  Chris Manghane  <cmang@google.com>
 
 	* lang.opt: Add -fgo-debug-escape option.

gcc/go/go-gcc.cc

@@ -541,7 +541,7 @@ private:
   std::map<std::string, Bfunction*> builtin_functions_;
 };
 
-// A helper function.
+// A helper function to create a GCC identifier from a C++ string.
 
 static inline tree
 get_identifier_from_string(const std::string& str)
@@ -549,6 +549,102 @@ get_identifier_from_string(const std::string& str)
   return get_identifier_with_length(str.data(), str.length());
 }
 
+// Return whether the character c is OK to use in the assembler.
+
+static bool
+char_needs_encoding(char c)
+{
+  switch (c)
+    {
+    case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
+    case 'G': case 'H': case 'I': case 'J': case 'K': case 'L':
+    case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R':
+    case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':
+    case 'Y': case 'Z':
+    case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
+    case 'g': case 'h': case 'i': case 'j': case 'k': case 'l':
+    case 'm': case 'n': case 'o': case 'p': case 'q': case 'r':
+    case 's': case 't': case 'u': case 'v': case 'w': case 'x':
+    case 'y': case 'z':
+    case '0': case '1': case '2': case '3': case '4':
+    case '5': case '6': case '7': case '8': case '9':
+    case '_': case '.': case '$': case '/':
+      return false;
+    default:
+      return true;
+    }
+}
+
+// Return whether the identifier needs to be translated because it
+// contains non-ASCII characters.
+
+static bool
+needs_encoding(const std::string& str)
+{
+  for (std::string::const_iterator p = str.begin();
+       p != str.end();
+       ++p)
+    if (char_needs_encoding(*p))
+      return true;
+  return false;
+}
+
+// Pull the next UTF-8 character out of P and store it in *PC.  Return
+// the number of bytes read.
+
+static size_t
+fetch_utf8_char(const char* p, unsigned int* pc)
+{
+  unsigned char c = *p;
+  if ((c & 0x80) == 0)
+    {
+      *pc = c;
+      return 1;
+    }
+  size_t len = 0;
+  while ((c & 0x80) != 0)
+    {
+      ++len;
+      c <<= 1;
+    }
+  unsigned int rc = *p & ((1 << (7 - len)) - 1);
+  for (size_t i = 1; i < len; i++)
+    {
+      unsigned int u = p[i];
+      rc <<= 6;
+      rc |= u & 0x3f;
+    }
+  *pc = rc;
+  return len;
+}
+
+// Encode an identifier using ASCII characters.
+
+static std::string
+encode_id(const std::string id)
+{
+  std::string ret;
+  const char* p = id.c_str();
+  const char* pend = p + id.length();
+  while (p < pend)
+    {
+      unsigned int c;
+      size_t len = fetch_utf8_char(p, &c);
+      if (len == 1 && !char_needs_encoding(c))
+	ret += c;
+      else
+	{
+	  ret += "$U";
+	  char buf[30];
+	  snprintf(buf, sizeof buf, "%x", c);
+	  ret += buf;
+	  ret += "$";
+	}
+      p += len;
+    }
+  return ret;
+}
+
 // Define the built-in functions that are exposed to GCCGo.
 
 Gcc_backend::Gcc_backend()
@@ -2454,8 +2550,14 @@ Gcc_backend::global_variable(const std::string& package_name,
       std::string asm_name(pkgpath);
       asm_name.push_back('.');
       asm_name.append(name);
+      if (needs_encoding(asm_name))
+	asm_name = encode_id(asm_name);
       SET_DECL_ASSEMBLER_NAME(decl, get_identifier_from_string(asm_name));
     }
+  else if (needs_encoding(var_name))
+    SET_DECL_ASSEMBLER_NAME(decl,
+			    get_identifier_from_string(encode_id(var_name)));
+
   TREE_USED(decl) = 1;
 
   if (in_unique_section)
@@ -2690,6 +2792,8 @@ Gcc_backend::implicit_variable(const std::string& name, Btype* type,
       SET_DECL_ALIGN(decl, alignment * BITS_PER_UNIT);
       DECL_USER_ALIGN(decl) = 1;
     }
+  if (needs_encoding(name))
+    SET_DECL_ASSEMBLER_NAME(decl, get_identifier_from_string(encode_id(name)));
 
   go_preserve_from_gc(decl);
   return new Bvariable(decl);
@@ -2742,6 +2846,8 @@ Gcc_backend::implicit_variable_reference(const std::string& name, Btype* btype)
   TREE_PUBLIC(decl) = 1;
   TREE_STATIC(decl) = 1;
   DECL_ARTIFICIAL(decl) = 1;
+  if (needs_encoding(name))
+    SET_DECL_ASSEMBLER_NAME(decl, get_identifier_from_string(encode_id(name)));
   go_preserve_from_gc(decl);
   return new Bvariable(decl);
 }
@@ -2766,6 +2872,8 @@ Gcc_backend::immutable_struct(const std::string& name, bool is_hidden,
   DECL_ARTIFICIAL(decl) = 1;
   if (!is_hidden)
     TREE_PUBLIC(decl) = 1;
+  if (needs_encoding(name))
+    SET_DECL_ASSEMBLER_NAME(decl, get_identifier_from_string(encode_id(name)));
 
   // When the initializer for one immutable_struct refers to another,
   // it needs to know the visibility of the referenced struct so that
@@ -2840,6 +2948,8 @@ Gcc_backend::immutable_struct_reference(const std::string& name, Btype* btype,
   DECL_ARTIFICIAL(decl) = 1;
   TREE_PUBLIC(decl) = 1;
   DECL_EXTERNAL(decl) = 1;
+  if (needs_encoding(name))
+    SET_DECL_ASSEMBLER_NAME(decl, get_identifier_from_string(encode_id(name)));
   go_preserve_from_gc(decl);
   return new Bvariable(decl);
 }
@@ -2931,6 +3041,8 @@ Gcc_backend::function(Btype* fntype, const std::string& name,
   tree decl = build_decl(location.gcc_location(), FUNCTION_DECL, id, functype);
   if (!asm_name.empty())
     SET_DECL_ASSEMBLER_NAME(decl, get_identifier_from_string(asm_name));
+  else if (needs_encoding(name))
+    SET_DECL_ASSEMBLER_NAME(decl, get_identifier_from_string(encode_id(name)));
   if (is_visible)
     TREE_PUBLIC(decl) = 1;
   if (is_declaration)